Evenly divide the oreo or digestive crumbs between your individual serving dishes and press into the bottom.In a large bowl, with an electric mixer, beat the cream cheese and Nutella until smooth. Add vanilla and mix to combine. Using a wooden spoon fold in the whipped cream until well blended.Spoon the filling into the individual serving dishes. Cover with plastic wrap and refrigerate for at least 2 hours before serving.Garnish with whipped cream, choco powder and chopped walnuts.